provider: Show an user friendly message when trying to use the plugin on non-Linux environments

CHANGELOG.md

@@ -8,6 +8,8 @@ IMPROVEMENTS:
 
   - The provider will now have a higher priority over the VirtualBox provider
     in case VirtualBox is installed alongside lxc dependecies.
+  - Show an user friendly message when trying to use the plugin on non-Linux
+    environments.
 
 
 ## [1.0.1](https://github.com/fgrehm/vagrant-lxc/compare/v1.0.0...v1.0.1) (Oct 15, 2014)

lib/vagrant-lxc/errors.rb

@@ -18,6 +18,10 @@ module Vagrant
       class NamespacesNotSupported < Vagrant::Errors::VagrantError
       end
 
+      class LxcLinuxRequired < Vagrant::Errors::VagrantError
+        error_key(:lxc_linux_required)
+      end
+
       class LxcNotInstalled < Vagrant::Errors::VagrantError
         error_key(:lxc_not_installed)
       end

lib/vagrant-lxc/provider.rb

@@ -9,6 +9,14 @@ module Vagrant
     class Provider < Vagrant.plugin("2", :provider)
       attr_reader :driver
 
+      def self.usable?(raise_error=false)
+        if !Vagrant::Util::Platform.linux?
+          raise Errors::LxcLinuxRequired
+        end
+
+        true
+      end
+
       def initialize(machine)
         @logger    = Log4r::Logger.new("vagrant::provider::lxc")
         @machine   = machine

locales/en.yml

@@ -56,6 +56,10 @@ en:
 
         Looked up under: %{paths}
 
+      lxc_linux_required: |-
+        The LXC provider only works on Linux. Please try to use
+        another provider.
+
       lxc_not_installed: |-
         The `lxc` package does not seem to be installed or is not accessible on the PATH.